diff --git a/lib/boleto.js b/lib/boleto.js
index 073a017..7cf644f 100644
--- a/lib/boleto.js
+++ b/lib/boleto.js
@@ -1,4 +1,3 @@
-var fs = require('fs')
 var ejs = require('ejs')
 var formatters = require('./formatters')
 var barcode = require('./barcode')
@@ -84,9 +83,13 @@ Boleto.prototype.renderHTML = function (callback) {
 
   renderOptions['boleto']['linha_digitavel_hash'] = hashString(renderOptions['boleto']['linha_digitavel']).toString()
 
-  var html = ejs.renderFile(__dirname + '/../assets/layout.ejs', renderOptions, {
+  ejs.renderFile(path.join(__dirname, '/../assets/layout.ejs'), renderOptions, {
     cache: true
   }, function (err, html) {
+    if (err) {
+      throw new Error(err)
+    }
+
     callback(html)
   })
 }